405728875818 has 24 divisors (see below), whose sum is σ = 1004661978528. Its totient is φ = 115922535912.

The previous prime is 405728875789. The next prime is 405728875823. The reversal of 405728875818 is 818578827504.

405728875818 is a `hidden beast` number, since 4 + 0 + 572 + 8 + 8 + 7 + 58 + 1 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1610035096 + ... + 1610035347.

It is an arithmetic number, because the mean of its divisors is an integer number (41860915772).

Almost surely, 2^405728875818 is an apocalyptic number.

405728875818 is an abundant number, since it is smaller than the sum of its proper divisors (598933102710).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405728875818 is a wasteful number, since it uses less digits than its factorization.

405728875818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220070458 (or 3220070455 counting only the distinct ones).

The product of its (nonzero) digits is 40140800, while the sum is 63.

The spelling of 405728875818 in words is "four hundred five billion, seven hundred twenty-eight million, eight hundred seventy-five thousand, eight hundred eighteen".